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      Question

      The cost price of 18 headsets equals the selling price

      of 12 headsets. The ratio of the cost price of a headset to a mobile cover is 5:3. The combined selling price of 8 headsets and 12 mobile covers is Rs.2100. Each mobile cover is sold at a 25% profit. Find the cost price of one headset.
      A Rs.350 Correct Answer Incorrect Answer
      B Rs.100 Correct Answer Incorrect Answer
      C Rs.240 Correct Answer Incorrect Answer
      D Rs.365 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let CP and SP of one headset be a and b. 18a = 12b โ†’ a/b = 2/3 CP(headset) = 2x SP(headset) = 3x CP cover = 2x ร— 3/5 = 6x/5 SP cover = 6x/5 ร— 125/100 = 3x/2 8ร—3x + 12ร—3x/2 = 24x + 18x = 42x = 2100 x = 2100/42 = 50 CP of one headset = 2x = Rs.100

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